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Resolved Image (PNG) as return from Rest API call

  1. How-to
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  1. Daniel Ferrreira
    Daniel Ferrreira
  2. PowerBuilder
  3. Monday, 11 April 2022 16:59 PM UTC

Hi guys,

!'m calling a rest API from PB, but instead or returning a JSON, this API returns a PNG (QRCode, to be specific). When I use the code:

restClient.sendGetRequest(as_url, as_jsonRet)

the as_jsonRet gets the content "PNG
". 

How should I proceed as to get this image retrieved and displayed in PB? Below is a print as Postman returns it.

Thanks a lot!!!

 

 

 

powerbuilder 2019 immediately crashes when I press...
Automatic builds on PB 2021
Accepted Answer
Chris Pollach @Appeon
Chris Pollach @Appeon Accepted Answer Pending Moderation
  1. Monday, 11 April 2022 17:20 PM UTC
  2. PowerBuilder
  3. # Permalink

Hi Daniel;

  Looks like you will need to return the image data stream into a Blob variable and then from there, transfer the BLob data stream into a Picture Control. Also, you might need to use the HTTPClient object class for this.

Regards ... Chris

Comment
Kevin Ridley
  1. Kevin Ridley
  2. Friday, 15 April 2022 18:06 PM UTC
Note you can also put the blob data stream into a file and open the file if you don't want to use the picture control..
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Responses (3)
Daniel Ferrreira
Daniel Ferrreira Accepted Answer Pending Moderation
  1. Monday, 11 April 2022 17:49 PM UTC
  2. PowerBuilder
  3. # 1

Because there isn't a SendGetRequest from the restClient object that receives a blob, only strings, correct?

Comment
Armeen Mazda @Appeon
  1. Armeen Mazda @Appeon
  2. Monday, 11 April 2022 17:56 PM UTC
JSON is text not binary so you need to Base64 encode the binary to text to be JSON format.
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Armeen Mazda @Appeon
Armeen Mazda @Appeon Accepted Answer Pending Moderation
  1. Monday, 11 April 2022 17:24 PM UTC
  2. PowerBuilder
  3. # 2

Blobs need to be Base64 encoded.

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